Sanding device for preparing graphene dispersion liquid

Abstract

The invention is suitable for the technical field of graphene sanding, and provides a sanding device for preparing graphene dispersion liquid, the sanding device comprises a base, a driving assembly and a sanding cylinder which are arranged at the top of the base, and a sanding assembly and a discharging assembly which are arranged in the sanding cylinder, sealing end covers are arranged at the two ends of the sanding cylinder, and a sanding cavity is formed in the sanding cylinder; the sanding assembly comprises a sleeve connected with the driving assembly, a primary dispersing disc and a secondary dispersing disc, the primary dispersing disc and the secondary dispersing disc are arranged on the sleeve, a first dispersing hole and a second dispersing hole are formed in the secondary dispersing disc, and the discharging assembly comprises a primary screening barrel connected with the sleeve and a discharging barrel arranged on the sealing end cover. According to the device, the problems that the stability of a turbulent flow field is damaged while the uniformity is improved through differential grinding, and graphene agglomeration is further caused are solved, and the effects that on the basis that the stability of the turbulent flow field in the grinding process is guaranteed, graded grinding is conducted on graphene of different finenesses, graphene agglomeration is avoided, and meanwhile the grinding uniformity is improved are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of graphene sand milling, and more specifically, to a sand milling device for preparing a graphene dispersion. Background Art

[0002] Graphene dispersion is a suspension formed by uniformly dispersing graphene nanosheets (multilayer graphene) in a liquid medium (such as water, organic solvent or polymer solution) by physical or chemical methods. During the preparation process of graphene dispersion, a sand mill is required to fully grind the graphene nanosheets and the liquid medium to ensure the uniformity of graphene in the dispersion.

[0003] The high shear force and inertial force in the turbulent flow field generated by the sand mill during operation can effectively peel off the graphene sheets. Through high-speed rotation and cavitation effect, the graphene layer structure is further peeled off, thereby obtaining thinner and more uniform graphene nanosheets. The degree of graphene fragmentation will gradually change during the grinding process. Adjusting the grinding speed for graphene of different fineness can effectively improve the uniformity of graphene. Some sand mills use differential grinding during the grinding process to improve the uniformity of grinding, but differential rotation will destroy the stability of the turbulent flow field. The stability of the turbulent flow field is affected, which will further cause the graphene in it to agglomerate, which will in turn cause the uniformity of the graphene dispersion to decrease. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a sand mill for preparing a graphene dispersion, which can grade graphene of different finenesses while ensuring the stability of the turbulent flow field during the grinding process, avoid graphene agglomeration and improve the grinding uniformity.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A sand milling device for preparing a graphene dispersion comprises a base, a driving assembly and a sand milling cylinder arranged on the top of the base, a sand milling assembly and a discharging assembly arranged inside the sand milling cylinder, wherein the sand milling cylinder is provided with sealing end covers at both ends and a sand milling cavity is provided inside, the sand milling assembly comprises a sleeve connected to the driving assembly, a primary dispersing disk and a secondary dispersing disk arranged on the sleeve, the secondary dispersing disk is provided with a first dispersing hole and a second dispersing hole, and the discharging assembly comprises a primary screening cylinder connected to the sleeve and a discharging cylinder arranged on the sealing end cover.

[0007] The present invention is further configured as follows: the preliminary dispersion disc is arranged on a side of the sleeve close to the driving assembly, and each preliminary dispersion disc is surrounded by a plurality of preliminary dispersion holes.

[0008] The present invention is further configured as follows: the secondary dispersion disk is arranged on a side of the sleeve away from the driving assembly, each of the secondary dispersion disks is provided with an inner cavity, and a plurality of inclined grooves are provided on the side wall of the secondary dispersion disk.

[0009] By adopting the above technical solution, the graphene dispersion passes through multiple primary dispersion disks in sequence, passes through the first dispersion hole to enter the inner cavity, is fully ground in the inner cavity, and then passes through the second dispersion hole to leave the inner cavity. In this process, the graphene dispersion is further fully crushed and sand-milled by the collision and shearing of the grinding medium and the graphene dispersion in the secondary dispersion disk, thereby improving the uniformity of the graphene dispersion.

[0010] The present invention is further configured as follows: a plurality of first dispersion holes are formed around the side of the secondary dispersion disk close to the driving component, and a plurality of second dispersion holes are formed around the side away from the driving component, the positions of each of the first dispersion holes and the second dispersion holes correspond to each other, and the aperture of the first dispersion hole is larger than the aperture of the second dispersion hole.

[0011] By adopting the above technical solution, since the aperture of the first dispersion hole is larger than the aperture of the second dispersion hole, the graphene dispersion liquid discharged from the inner cavity per unit time is less than the graphene dispersion liquid entering the inner cavity, which can ensure that the graphene dispersion liquid can be fully sanded after entering the inner cavity.

[0012] The present invention is further configured as follows: the primary screening cylinder is sleeved on the outside of the discharging cylinder, the primary screening cylinder is configured as a hollow structure, a threaded groove is provided on the primary screening cylinder, and a plurality of stirring rods are arranged around the outer wall of the primary screening cylinder.

[0013] The present invention is further configured as follows: a filter screen is arranged on one side of the discharge barrel close to the sand grinding assembly, and the filter screen is arranged as a spiral structure, and the spiral direction is consistent with the direction of the thread groove.

[0014] By adopting the above technical solution, the spiral direction and the thread groove direction of the filter are consistent with the direction of the turbulent flow field inside the sand grinding chamber, which can ensure that the graphene dispersion enters the discharge barrel in a direction consistent with the turbulent flow field, avoiding the re-agglomeration of the fully ground graphene dispersion due to the change in flow direction.

[0015] The present invention is further configured as follows: a cooling pipe is arranged inside the discharge barrel, and the cooling pipe is arranged through the sealing end cover.

[0016] The present invention is further configured as follows: the driving assembly includes a rotating shaft connected to the sleeve, a matching wheel arranged at the end of the rotating shaft, and a motor arranged inside the base, and the motor and the matching wheel are connected via a pulley.

[0017] The present invention is further configured as follows: a bearing is sleeved on a side of the rotating shaft close to the sealing end cover, and the rotating shaft can rotate relative to the sealing end cover.

[0018] The present invention is further configured as follows: a feeding pipe is arranged on the side of the sanding barrel close to the driving component, and a discharging pipe is arranged on the side away from the driving component, and the feeding pipe and the discharging pipe are respectively communicated with the sanding chamber.

[0019] The beneficial effects of the present invention are:

[0020] First, the graphene dispersion is subjected to primary sand grinding using a primary dispersion disk. When the graphene fineness becomes smaller, secondary sand grinding is performed using a secondary dispersion disk. On the basis of the consistent rotation speed of the primary dispersion disk and the secondary dispersion disk, graphene of different finenesses can be graded and ground. The stability of the turbulent flow field inside the sand grinding chamber can also be ensured, thereby avoiding the destruction of the turbulent flow field due to graded sand grinding, which would cause agglomeration of the graphene dispersion. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 It is a schematic structural diagram of a sand milling device for preparing a graphene dispersion according to the present invention.

[0023] Figure 2 for Figure 1 Schematic diagram of the exploded structure of a sand milling device for preparing graphene dispersion.

[0024] Figure 3 for Figure 1 The top view after the base is removed is shown.

[0025] Figure 4 For along Figure 3 A cross-sectional view taken along the AA cutting line is shown.

[0026] Figure 5 for Figure 4 Schematic diagram of the explosion structure after the sanding cylinder is removed.

[0027] Figure 6 for Figure 5 Front view shown.

[0028] Figure 7 for Figure 6 Schematic diagram of the explosion structure shown.

[0029] Figure 8 for Figure 7 An exploded schematic diagram of the sanding assembly is shown.

[0030] Fig. 9 for Figure 8 A front view of the secondary dispersion disk is shown.

[0031] Fig.10 for Figure 7 Schematic diagram of the structure of the primary screening cylinder shown.

[0032] Fig.11 for Figure 7 Schematic diagram of the structure of the discharge barrel.

[0033] Fig.12 For along Fig.11 A cross-sectional view taken along the BB section line is shown.

[0034] Description of reference numerals: 1, base; 11, top cover; 12, console; 13, fixing base;

[0035] 2. driving assembly; 21. motor; 22. matching wheel; 23. rotating shaft; 24. bearing; 25. bearing seat;

[0036] 3. Sanding cylinder; 31. Sealing end cover; 32. Sanding chamber; 33. Cooling chamber; 34. Water cooling inlet pipe; 35. Water cooling outlet pipe; 36. Support seat;

[0037] 4. Sanding assembly; 41. Sleeve; 411. Limiting groove; 42. Primary dispersion disc; 421. Primary dispersion hole; 43. Secondary dispersion disc; 431. Inner cavity; 432. Inclined groove; 433. First dispersion hole; 434. Second dispersion hole;

[0038] 5. Discharging assembly; 51. Primary screening cylinder; 511. Threaded groove; 512. Stirring rod; 52. Discharging cylinder; 521. Filter screen; 522. Cooling pipe; 523. Water inlet; 524. Water outlet;

[0039] 6. Feed pipe; 61. Feed inlet;

[0040] 7. Discharge pipe; 71. Discharge port. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is now described in detail in conjunction with the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basics of the present invention in an illustrative manner, so it only shows the composition related to the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0042] Example 1, please refer to Figure 1-4The sand milling device for preparing graphene dispersion includes a base 1, a driving component 2 and a sand milling cylinder 3 arranged on the top of the base 1, a sand milling component 4 and a discharge component 5 arranged inside the sand milling cylinder 3. The sand milling cylinder 3 is provided with a feed pipe 6 on the side close to the driving component 2, and a discharge pipe 7 on the side away from the driving component 2. The graphene dispersion raw material enters the sand milling cylinder 3 through the feed pipe 6, and a grinding medium (such as grinding zirconium beads) is placed inside the sand milling cylinder 3. The driving component 2 can drive the sand milling component 4 inside the sand milling cylinder 3 to rotate, and the graphene dispersion is ground by the shear force generated by the collision between the sand milling component 4 and the grinding medium during the rotation process. After the grinding, the graphene dispersion is further filtered by the discharge component 5 and finally discharged from the discharge pipe 7.

[0043] Please refer to Figure 1-2 The interior of the base 1 is set as a hollow structure, and a top cover 11 is set on one side of the top of the base 1. A control console 12 for controlling the operation of the sanding device is set at the side wall of the base 1 corresponding to the top cover 11, and a fixing seat 13 for limiting the connection between the sanding cylinder 3 and the driving component 2 is set on the top of the base 1 near the top cover 11.

[0044] Please refer to Figure 1-6 The driving assembly 2 includes a rotating shaft 23 connected to the sleeve 41, a matching wheel 22 arranged at the end of the rotating shaft 23, and a motor 21 arranged inside the base 1. The matching wheel 22 is arranged inside the top cover 11, and the motor 21 and the matching wheel 22 are connected by a pulley, and the motor 21 can drive the matching wheel 22 to rotate. A bearing 24 is sleeved on the side of the rotating shaft 23 close to the sanding cylinder 3, and the rotating shaft 23 can rotate relative to the sanding cylinder 3 through the connection of the bearing 24. A bearing seat 25 is arranged at the connection between the rotating shaft 23 and the sanding cylinder 3, and the bearing seat 25 can realize the connection between the sanding cylinder 3 and the bearing 24, and between the rotating shaft 23 and the base 1.

[0045] Please refer to Figure 1-4The sand mill 3 is configured as a hollow cylindrical structure, and sealing end covers 31 are provided at both ends of the sand mill 3. The sealing end covers 31 are mechanical sealing structures to ensure the sealing inside the sand mill 3. The sealing end cover 31 close to the driving component 2 is connected to the bearing 24 to ensure that the rotating shaft 23 can rotate relative to the sealing end cover 31. A sand mill chamber 32 is provided inside the sand mill 3, and grinding media can be placed inside the sand mill chamber 32 to grind the graphene dispersion. A cooling chamber 33 is provided outside the sand mill chamber 32, and the cooling chamber 33 and the sand mill chamber 32 are separated from each other. A water-cooled water inlet pipe 34 is provided on the top of the sand mill 3 close to the driving component 2, and a water-cooled water outlet pipe 35 is provided on the side away from the driving component 2. The water-cooled water inlet pipe 34 and the water-cooled water outlet pipe 35 are both connected to the cooling chamber 33. Cold water can enter the cooling chamber 33 through the water-cooling outlet pipe 35 to cool the sand milling chamber 32. The low probability of agglomeration of the graphene dispersion in a low temperature environment can be used to reduce the probability of agglomeration of the graphene dispersion during the sand milling process to a certain extent. After the cycle is completed, the water is discharged from the water-cooling outlet pipe 35. A support seat 36 is provided at the bottom of the sand milling cylinder 3, and the support seat 36 is provided on the top of the base 1 to support the sand milling cylinder 3.

[0046] Please refer to Figure 4-9 The sanding assembly 4 includes a sleeve 41 connected to the drive assembly 2, a primary dispersion disc 42 and a secondary dispersion disc 43 arranged on the sleeve 41. The graphene dispersion is first sanded by the primary dispersion disc 42, and then sanded by the secondary dispersion disc 43, so as to improve the uniformity of the graphene dispersion. The sleeve 41 is set as a hollow cylindrical structure, the inner diameter of the sleeve 41 is adapted to the outer diameter of the rotating shaft 23, the sleeve 41 is connected to the rotating shaft 23, and can rotate synchronously with the rotating shaft 23, so that the graphene dispersion flow in the sanding chamber 32 generates a turbulent flow field. A plurality of limiting grooves 411 are arranged on the sleeve 41, and the connection between the primary dispersion disc 42 and the secondary dispersion disc 43 and the sleeve 41 is realized by the limiting grooves 411. The primary dispersion disc 42 is arranged on the sleeve 41 near the driving assembly 2, and each primary dispersion disc 42 is arranged inside the limiting groove 411. A plurality of primary dispersion holes 421 are formed around each primary dispersion disk 42. When the sleeve 41 rotates following the rotating shaft 23, the primary dispersion disk 42 rotates synchronously. The grinding medium in the sand milling chamber 32 continuously collides with the primary dispersion disk 42 to generate shear force, and the graphene dispersion liquid is sand milled by the shear force. During the sand milling process, the grinding medium and the graphene dispersion liquid can pass through the primary dispersion holes 421 on the primary dispersion disk 42 to enter the next primary dispersion disk 42 for grinding, which helps to form a stable turbulent flow field inside the sand milling chamber 32.

[0047] Please refer to Figure 4-9, the secondary dispersion disk 43 is arranged on the side of the sleeve 41 away from the driving assembly 2, and each secondary dispersion disk 43 is arranged inside the limiting groove 411. The secondary dispersion disk 43 is arranged as a hollow structure, and an inner cavity 431 is arranged inside each secondary dispersion disk 43. A first dispersion hole 433 and a second dispersion hole 434 are provided on the secondary dispersion disk 43. A plurality of first dispersion holes 433 are provided around the side of the secondary dispersion disk 43 close to the driving assembly 2, and a plurality of second dispersion holes 434 are provided around the side away from the driving assembly 2. The positions of each first dispersion hole 433 and the second dispersion hole 434 correspond to each other, and the aperture of the first dispersion hole 433 is larger than the aperture of the second dispersion hole 434. The first dispersion hole 433 and the second dispersion hole 434 are respectively connected to the inner cavity 431. During the grinding process, the graphene dispersion passes through the plurality of primary dispersion disks 42 in sequence, passes through the first dispersion hole 433 to enter the inner cavity 431, and after being fully ground inside the inner cavity 431, passes through the second dispersion hole 434 to leave the inner cavity 431. In this process, the graphene dispersion is further fully crushed and sand-milled by the collision and shearing of the grinding medium and the graphene dispersion in the secondary dispersion disk 43, thereby improving the uniformity of the graphene dispersion. Since the aperture of the first dispersion hole 433 is larger than the aperture of the second dispersion hole 434, the graphene dispersion discharged from the inner cavity 431 per unit time is less than the graphene dispersion entering the inner cavity 431, which can ensure that the graphene dispersion can be fully sand-milled after entering the inner cavity 431, thereby improving the uniformity of the graphene dispersion. The graphene dispersion is firstly sand-milled by the primary dispersion disk 42, and when the fineness of the graphene decreases, the secondary dispersion disk 43 is used for secondary sand-milling. On the basis of the consistent rotation speed of the primary dispersion disk 42 and the secondary dispersion disk 43, the graphene of different finenesses is graded and ground, and the stability of the turbulent flow field inside the sand-milling cavity 32 can be ensured, so as to avoid the destruction of the turbulent flow field due to graded sand-milling, and cause the graphene dispersion to agglomerate. A plurality of inclined grooves 432 are provided on the side wall of the secondary dispersion disk 43. The inclination direction of the inclined grooves 432 is consistent with the direction of the turbulent flow field inside the sand milling chamber 32. Part of the grinding media and graphene dispersion liquid that have been sand milled can also be discharged from the inclined grooves 432 without destroying the stability of the turbulent flow field inside the sand milling chamber 32.

[0048] Please refer to Figure 4-7 and Figure 10-12The discharging assembly 5 includes a primary screening cylinder 51 connected to the sleeve 41 and a discharging cylinder 52 arranged on the sealing end cover 31. After the sand milling is completed, the graphene dispersion is first filtered by the primary screening cylinder 51, and then enters the inside of the discharging cylinder 52 for further filtration and cooling before being finally discharged. The primary screening cylinder 51 is sleeved on the outside of the discharging cylinder 52, and the end of the primary screening cylinder 51 is connected to the end of the sleeve 41. The primary screening cylinder 51 is set as a hollow structure, and a thread groove 511 is opened on the primary screening cylinder 51. A plurality of stirring rods 512 are arranged around the outer wall of the primary screening cylinder 51. The direction of the thread groove 511 is consistent with the direction of the turbulent flow field inside the sand milling chamber 32. When the graphene dispersion enters the interior of the primary screening cylinder 51 from the thread groove 511, the thread groove 511 can not only be used to preliminarily filter the graphene dispersion, but also the stability of the turbulent flow field inside the sand milling chamber 32 will not be destroyed. The stirring rod 512 can form a flow field direction consistent with the turbulent flow field inside the sand mill chamber 32 during rotation, slowing down the rate at which the graphene dispersion enters the primary screening cylinder 51, facilitating full filtration of the graphene dispersion while ensuring the stability of the turbulent flow field.

[0049] Please refer to Figure 4-7 and Figure 10-12 , the end of the discharge barrel 52 is connected to the sealing end cover 31, and a filter screen 521 is provided on the side of the discharge barrel 52 close to the sand grinding component 4. The filter screen 521 is arranged as a spiral structure, and the spiral direction is consistent with the direction of the thread groove 511. After the graphene dispersion enters the primary screening barrel 51 through the thread groove 511 and completes the filtration, it continues to pass through the filter screen 521 for secondary filtration to ensure that the discharged graphene dispersion is sand-milled sufficiently and evenly. The spiral direction of the filter screen 521 is consistent with the direction of the thread groove 511, which can ensure that the graphene dispersion enters the discharge barrel 52 in a direction consistent with the turbulent flow field, avoiding the situation where the fully ground graphene dispersion re-agglomerates due to the change in flow direction. A cooling pipe 522 is arranged inside the discharge barrel 52, and the cooling pipe 522 runs through the sealing end cover 31. The cooling pipe 522 is spirally arranged inside the discharge barrel 52, one end of the cooling pipe 522 is connected to a water inlet 523, and the other end is connected to a water outlet 524, and the water inlet 523 and the water outlet 524 are both arranged outside the end cover 31. Cold water can enter the cooling pipe 522 through the water inlet 523, circulate inside the discharge barrel 52, cool the graphene dispersion, reduce the probability of agglomeration of the graphene dispersion, and then be discharged from the water outlet 524.

[0050] Please refer to Figure 1-4The sand mill 3 is provided with a feed pipe 6 on the side close to the drive assembly 2 and a discharge pipe 7 on the side away from the drive assembly 2. A feed port 61 is provided at the end of the feed pipe 6, and the feed port 61 passes through the end cover 31 and communicates with the inside of the sand mill chamber 32. The graphene dispersion liquid raw material can enter the sand mill chamber 32 from the feed port 61 through the feed pipe 6 for sand milling. A discharge port 71 is provided at the end of the discharge pipe 7, and the discharge port 71 passes through the end cover 31 and communicates with the inside of the discharge barrel 52. The graphene dispersion liquid after sand milling can be discharged from the discharge port 71 after being filtered by the discharge barrel 52.

[0051] Specifically, the graphene dispersion liquid raw material enters the sand milling chamber 32 from the feed port 61 through the feed pipe 6, and the motor 21 drives the matching wheel 22 to rotate, and synchronously drives the rotating shaft 23 to rotate relative to the sand milling cylinder 3. During the process of the sleeve 41 following the rotating shaft 23 to rotate, the graphene dispersion liquid passes through a plurality of primary dispersion discs 42 in sequence, and the primary sand milling is performed by utilizing the shear force generated by the collision between the primary dispersion discs 42 and the grinding medium. After the primary sand milling is completed, the graphene dispersion liquid passes through the first dispersion hole 433 into the inner cavity 431, and after being fully ground inside the inner cavity 431, it passes through the second dispersion hole 434 to leave the inner cavity 431, completing the secondary sand milling. During the secondary sand milling process, the graphene dispersion liquid discharged from the inner cavity 431 is less than the graphene dispersion liquid entering the inner cavity 431, ensuring that the graphene dispersion liquid can be fully sand milled after entering the inner cavity 431, thereby improving the uniformity of the graphene dispersion liquid.

[0052] During the sand grinding process, the graphene dispersion is firstly sand ground using the primary dispersion disk 42. When the graphene fineness becomes smaller, the secondary dispersion disk 43 is used for secondary sand grinding to achieve graded grinding of graphene of different finenesses. At the same time, because the rotation speeds of the primary dispersion disk 42 and the secondary dispersion disk 43 are consistent, the turbulent flow field inside the sand grinding chamber 32 can be kept stable, thereby avoiding the destruction of the turbulent flow field due to graded sand grinding, which would cause the graphene dispersion to agglomerate.

[0053] After the secondary sand milling is completed, the graphene dispersion enters the primary screening cylinder 51 through the thread groove 511 to complete the filtration, and then continues to be filtered through the filter screen 521 for secondary filtration to ensure that the discharged graphene dispersion is fully and evenly sand milled. During the filtration process, the spiral direction of the filter screen 521 and the direction of the thread groove 511 are consistent with the direction of the turbulent flow field inside the sand milling chamber 32, which can ensure that the graphene dispersion enters the discharge cylinder 52 in a direction consistent with the turbulent flow field, and avoids the situation that the fully ground graphene dispersion regenerates agglomeration due to the change in flow direction. At the same time, the graphene dispersion is cooled by the cooling pipe 522 inside the discharge cylinder 52 to reduce the probability of agglomeration of the graphene dispersion, and the cooled graphene dispersion finally completes the discharge from the discharge port 71.

[0054] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0056] The above is based on the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications without departing from the scope of the present invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A sand milling device for preparing a graphene dispersion, characterized in that: The invention comprises a base (1), a driving assembly (2) and a sanding cylinder (3) arranged on the top of the base (1), a sanding assembly (4) and a discharge assembly (5) arranged inside the sanding cylinder (3), wherein the sanding cylinder (3) is provided with sealing end covers (31) at both ends and a sanding cavity (32) is provided inside, the sanding assembly (4) comprises a sleeve (41) connected to the driving assembly (2), a primary dispersion disk (42) and a secondary dispersion disk (43) arranged on the sleeve (41), the secondary dispersion disk (43) being provided with a first dispersion hole (433) and a second dispersion hole (434), and the discharge assembly (5) comprises a primary screening cylinder (51) connected to the sleeve (41) and a discharge cylinder (52) arranged on the sealing end cover (31).

2. The sand milling device for preparing a graphene dispersion according to claim 1, characterized in that: The initial dispersion disc (42) is arranged on a side of the sleeve (41) close to the driving assembly (2), and each initial dispersion disc (42) is surrounded by a plurality of initial dispersion holes (421).

3. The sand milling device for preparing a graphene dispersion according to claim 2, characterized in that: The secondary dispersion disc (43) is arranged on a side of the sleeve (41) away from the driving assembly (2), each of the secondary dispersion discs (43) is provided with an inner cavity (431), and a plurality of inclined grooves (432) are provided on the side wall of the secondary dispersion disc (43).

4. The sand milling device for preparing a graphene dispersion according to claim 3, characterized in that: The secondary dispersion disk (43) is provided with a plurality of first dispersion holes (433) on the side close to the driving component (2), and a plurality of second dispersion holes (434) on the side away from the driving component (2), wherein the positions of each of the first dispersion holes (433) and the second dispersion holes (434) correspond to each other, and the aperture of the first dispersion hole (433) is larger than the aperture of the second dispersion hole (434).

5. The sand milling device for preparing a graphene dispersion according to claim 1, characterized in that: The primary screening cylinder (51) is sleeved on the outside of the discharge cylinder (52); the primary screening cylinder (51) is arranged as a hollow structure; a threaded groove (511) is provided on the primary screening cylinder (51); and a plurality of stirring rods (512) are arranged around the outer wall of the primary screening cylinder (51).

6. The sand milling device for preparing a graphene dispersion according to claim 5, characterized in that: A filter screen (521) is arranged on one side of the discharge barrel (52) close to the sand grinding assembly (4); the filter screen (521) is arranged in a spiral structure, and the spiral direction is consistent with the direction of the thread groove (511).

7. The sand milling device for preparing a graphene dispersion according to claim 6, characterized in that: A cooling pipe (522) is arranged inside the discharge barrel (52), and the cooling pipe (522) passes through the sealing end cover (31).

8. The sand milling device for preparing a graphene dispersion according to claim 1, characterized in that: The driving assembly (2) comprises a rotating shaft (23) connected to the sleeve (41), a matching wheel (22) arranged at the end of the rotating shaft (23), and a motor (21) arranged inside the base (1); the motor (21) and the matching wheel (22) are connected via a pulley.

9. The sand milling device for preparing a graphene dispersion according to claim 8, characterized in that: A bearing (24) is sleeved on one side of the rotating shaft (23) close to the sealing end cover (31), and the rotating shaft (23) can rotate relative to the sealing end cover (31).

10. The sand milling device for preparing a graphene dispersion according to claim 1, characterized in that: The sanding cylinder (3) is provided with a feed pipe (6) on the side close to the driving assembly (2), and a discharge pipe (7) on the side away from the driving assembly (2), and the feed pipe (6) and the discharge pipe (7) are respectively connected to the sanding chamber (32).

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